Camera assembly capable of increasing monitoring range

Abstract

The invention discloses a camera assembly capable of increasing the monitoring range, and belongs to the field of monitoring equipment. Comprising a guide rail, and the front surface of the guide rail is fixedly connected with a first rack; a moving seat is arranged above the guide rail, the inner side of the moving seat is rotatably connected with a screw rod sleeve through a rotating shaft, the inner side of the screw rod sleeve is provided with a shifting screw rod, the outer side wall of the screw rod sleeve is fixedly connected with a shifting sleeve above the rack I, and the outer side wall of the shifting sleeve is fixedly connected with a plurality of shifting teeth I; a motor is started, a first gear is intermittently poked through second poke teeth on the outer side wall of a poke disc, so that an eccentric disc rotates intermittently, a poke lead screw can be pulled to move back and forth along the inner side of a lead screw sleeve through traction of a traction rod, and then the lead screw sleeve is driven to rotate back and forth; and the moving seat is controlled to move leftwards or rightwards, so that the transverse monitoring range of the monitoring device can be enlarged.

Description

Technical Field

[0001] The present invention relates to the field of monitoring devices, and particularly to a camera assembly that can increase the monitoring range. Background Art

[0002] A typical television monitoring system mainly consists of two major parts: front-end devices and back-end devices. The front-end devices usually consist of components such as cameras, manual or motorized lenses, pan-tilt units, protective enclosures, microphones, alarm detectors, and multi-functional decoders. They each perform their own functions and establish corresponding connections with various devices in the central control system through wired, wireless, or fiber optic transmission media. In an actual television monitoring system, these front-end devices are not necessarily used simultaneously, but a camera and a lens for collecting on-site monitoring images are essential. The back-end devices can be further divided into central control devices and sub-controls; Patent: CN211925319U discloses a monitoring camera with a wide monitoring range, including a mounting plate, a rotating mechanism, and a camera assembly. A rotating mechanism is provided at the bottom of the mounting plate, and a camera assembly is provided at the bottom of the rotating mechanism. The rotating mechanism includes a bearing fixed in a groove at the bottom of the mounting plate. A support shaft is movably connected inside the bearing. The bottom of the support shaft passes through the bearing and extends to the outside. A gear is fixedly connected to the surface of the support shaft, and a rack is provided behind the gear. Through the mutual cooperation of the mounting plate, the rotating mechanism, and the camera assembly, the device achieves the effect of a wide monitoring range, enabling the camera body to perform multi-angle monitoring, greatly improving the monitoring range, thus avoiding opportunities for lawbreakers. And when the camera body is damaged, it can be disassembled quickly and conveniently for repair, greatly improving the practicality of the device; In the above technology, the camera can only rotate and monitor at the installation position. Affected by the monitoring range of the camera itself, in this way, only the scenes within the rotation range can be monitored, and the camera cannot be moved horizontally. The monitoring range is controlled by controlling the position of the camera. And some of the existing technologies for horizontal movement are continuous reciprocating movements, which easily cause the monitored object to flash by and cannot stay briefly after moving for monitoring. Improvements are needed. For this reason, we propose a camera assembly that can increase the monitoring range. Summary of the Invention

[0003] Object of the Invention: The object of the present invention is to provide a camera that can move horizontally to increase the monitoring range; another object of the present invention is to provide that the camera can stay briefly after moving to ensure clear monitoring.

[0004] Technical Solution: A camera assembly that can increase the monitoring range includes a guide rail, and a first rack is fixedly connected to the front surface of the guide rail; Above the guide rail, a moving seat is provided. Inside the moving seat, a lead screw sleeve is rotatably connected through a rotating shaft. Inside the lead screw sleeve, a toggle lead screw is provided. Above the first rack, a toggle sleeve is fixedly connected to the outer side wall of the lead screw sleeve. A plurality of first toggle teeth are fixedly connected to the outer side wall of the toggle sleeve. On the upper surface of the moving seat, a shaft column is rotatably connected through a rotating shaft. At the top of the shaft column, a monitoring device is fixedly connected. At the rear of the guide rail and on the lower surface of the moving seat, a mounting seat is fixedly connected. On the upper surface of the mounting seat, a mounting box is fixedly connected. Inside the mounting box, on the left side, a shaft rod is rotatably connected through a rotating shaft. At the right end of the shaft rod, there are two eccentric discs. The left center of the eccentric disc located on the left side inside the mounting box is fixedly connected to the right end of the shaft rod. A through adjustment groove is provided on the left side of the eccentric disc. Inside the adjustment groove, an adjustment block is slidably connected. Between the two adjustment blocks, a cylinder is fixedly connected. The outer side wall of the cylinder is rotatably connected to a traction rod through a rotating shaft. One end of the traction rod is rotatably connected to a concave member through a rotating shaft. The front surface of the concave member is fixedly connected to the rear end of the toggle lead screw.

[0005] Furthermore, at the right center of the eccentric disc located on the right side inside the mounting box, a first gear is fixedly connected. Inside the mounting box, at the lower right side, a motor is fixedly connected. At the left end of the output shaft of the motor and below the first gear, a toggle disc is fixedly connected. A plurality of second toggle teeth are fixedly connected to the outer side wall of the toggle disc. Inside the guide rail and on the inner side of the moving seat, a guide rod is fixedly connected. The guide rod is slidably connected to the moving seat.

[0006] Furthermore, a plurality of first springs are fixedly connected to both sides of the moving seat. The ends of the plurality of first springs on the same side away from the moving seat are commonly fixedly connected to a pressure-receiving strip. On the opposite sides of the two pressure-receiving strips and above the moving seat, a second rack is commonly fixedly connected. A second gear is fixedly connected to the outer side wall of the shaft column. Both second racks are meshed with the second gear.

[0007] Furthermore, fixed strips are fixedly connected to both sides of the lower surface of the guide rail. A cross bar is fixedly connected between the two fixed strips. A sliding block is slidably connected to the outer side wall of the cross bar. A plurality of support rods are fixedly connected between the rear surface of the sliding block and the lower surface of the mounting seat.

[0008] Furthermore, a moving piece is fixedly connected to the front surface of the concave member and on the outer side wall of the toggle lead screw. Two longitudinal rods are slidably connected to the lower part of the moving piece. The front ends of the longitudinal rods are fixedly connected to the front inner surface of the mounting seat.

[0009] Furthermore, an adjusting bolt is threadedly connected to the inner side of the adjusting block located on the right side of the installation box, and the bottom end of the adjusting bolt is rotatably connected to the lower surface of the adjusting slot located on the right side of the installation box through a rotating shaft.

[0010] Furthermore, a plurality of hemispherical holes are opened on the right side of the gear 1, a shrinkage tube is fixedly connected on the right side of the interior of the installation box and located above the motor, a plurality of shrinkage cavities are opened inside the shrinkage tube, a limiting column is slidably connected inside the shrinkage cavity, the left end of the limiting column is inserted into the inner side of the hemispherical hole, and a spring 2 is fixedly connected between the shrinkage cavity and the limiting column.

[0011] Furthermore, a plurality of slots are provided on both sides of the inner rear surface of the guide rail, and blocking plates are engaged with the inner sides of the slots located on the left and right sides of the inner part of the guide rail.

[0012] Furthermore, the upper surface of the movable seat is symmetrically provided with anti-slip grooves, the interior of the anti-slip groove is fixedly connected with an anti-slip rod, the outer side wall of the anti-slip rod is slidably connected with an anti-slip block, and the top of the anti-slip block is fixedly connected to the lower surface of the rack 2.

[0013] Beneficial effect: start the motor, and intermittently shift the gear 1 through the shifting tooth 2 on the outer wall of the shifting disk, so that the eccentric disk rotates intermittently, and the traction rod is used to pull the shifting screw to move back and forth along the inner side of the screw sleeve, thereby driving the screw sleeve to rotate back and forth, and the meshing transmission of the shifting tooth 1 and the rack 1 controls the moving seat to move left or right, thereby increasing the lateral monitoring range of the monitoring device; The toggle gear is intermittently arranged, so that the toggle sleeve will intermittently mesh with the rack during the reciprocating rotation, so that when there is no meshing transmission, the moving seat will not drive the monitoring device to move, so that the monitoring device can stably stay at the current position for monitoring, and because the eccentric disk rotates intermittently, the toggle screw rod intermittently drives the screw rod sleeve to rotate, further increasing the stay time of the monitoring device after moving, so that the monitoring device can be stably parked for monitoring after moving; When the moving seat reciprocates left and right along the guide rod, the two pressure bars on the left and right sides can contact the blocking plates on the left and right sides of the guide rail respectively, and squeeze the pressure bars as they move to move the rack gear 2, and the rack gear 2 drives the gear gear 2 to drive the monitoring device to rotate. When the monitoring device moves to the right and left sides along the guide rail, it will rotate to the right and left sides respectively, further increasing the monitoring range. The blocking plate can be inserted into the card slots at different positions, so that after the moving seat moves to different distances, it blocks the pressure strip, causing the pressure strip to be squeezed and driving the monitoring device to turn; By holding the adjusting bolt and turning it, the adjusting block is controlled to slide along the adjusting slot, thereby controlling the distance between the cylinder and the central axis of the eccentric disk. Subsequently, when the eccentric disk rotates, the reciprocating distance of the traction rod pulling the toggle screw can be adjusted, so that the monitoring device can control the range of left and right reciprocating movement under different monitoring requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view structural schematic diagram of the present invention; Figure 2 It is a side structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the side view connection structure of the mounting seat, the mounting box, the traction rod and the toggle screw rod of the present invention; Figure 4 It is a schematic diagram of the connection structure of the installation box, the shaft rod, the eccentric disk, the motor and the shrinking cylinder of the present invention; Figure 5 It is a side view structural schematic diagram of the eccentric disk of the present invention; Figure 6 is a side structural schematic diagram of a gear 1 of the present invention; Figure 7 It is a schematic cross-sectional structural diagram of the shrink tube of the present invention; Figure 8 It is a schematic diagram of the connection structure of the moving base, the monitoring device, the guide rod, the second gear and the second rack of the present invention; Figure 9 It is a schematic diagram of the structure of the mobile seat of the present invention when viewed from above; Figure 10 The present invention Figure 1 A is an enlarged structural diagram of FIG.

[0015] In the figure: 1, guide rail; 2, rack 1; 3, moving seat; 4, screw sleeve; 5, toggle screw; 6, toggle sleeve; 7, toggle gear 1; 8, shaft column; 9, monitoring device; 10, mounting seat; 11, mounting box; 12, shaft; 13, eccentric plate; 14, adjustment groove; 15, adjustment block; 16, cylinder; 17, traction rod; 18, concave member; 19, gear 1; 20, motor; 21, toggle plate; 22, toggle gear 2; 23 , guide rod; 24, spring one; 25, pressure strip; 26, rack two; 27, gear two; 28, fixed strip; 29, cross bar; 30, sliding block; 31, support rod; 32, moving piece; 33, longitudinal rod; 34, adjusting bolt; 35, hemispherical hole; 36, contraction cylinder; 37, contraction cavity; 38, limit column; 39, anti-slip groove; 40, anti-slip rod; 41, anti-slip block; 42, spring two; 43, slot; 44, blocking plate. DETAILED DESCRIPTION

[0016] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Example like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a camera assembly capable of increasing the monitoring range is provided, comprising a guide rail 1, a rack 2 being fixedly connected to the front surface of the guide rail 1; A moving seat 3 is arranged above the guide rail 1, and a screw sleeve 4 is rotatably connected to the inner side of the moving seat 3 through a rotating shaft, and a toggle screw 5 is arranged on the inner side of the screw sleeve 4. The outer side wall of the screw sleeve 4 is located above the rack 2 and is fixedly connected to a toggle sleeve 6, and the outer side wall of the toggle sleeve 6 is fixedly connected to a plurality of toggle teeth 7; The upper surface of the movable seat 3 is rotatably connected to a shaft column 8 via a rotating shaft, and the top of the shaft column 8 is fixedly connected to a monitoring device 9; The lower surface of the movable seat 3 is located at the rear of the guide rail 1 and is fixedly connected with a mounting seat 10. The upper surface of the mounting seat 10 is fixedly connected with a mounting box 11. The left side of the interior of the mounting box 11 is rotatably connected with a shaft 12 through a rotating shaft. Two eccentric disks 13 are arranged on the right end of the shaft 12. The left center of the eccentric disk 13 located on the left side of the interior of the mounting box 11 is fixedly connected to the right end of the shaft 12. A through-type adjustment groove 14 is provided on the left side of the eccentric disk 13. An adjustment block 15 is slidably connected inside the adjustment groove 14. A cylinder 16 is fixedly connected between the two adjustment blocks 15. The outer wall of the cylinder 16 is rotatably connected with a traction rod 17 through a rotating shaft. One end of the traction rod 17 is rotatably connected with a concave piece 18 through a rotating shaft. The front surface of the concave piece 18 is fixedly connected to the rear end of the toggle screw rod 5. A gear 19 is fixedly connected to the right center of the eccentric disk 13 located on the right side of the installation box 11, a motor 20 is fixedly connected to the lower right side of the installation box 11, a toggle disk 21 is fixedly connected to the left end of the output shaft of the motor 20 and located below the gear 19, and a toggle gear 22 is fixedly connected to the outer wall of the toggle disk 21; When the device is in use, the motor 20 is started, and the gear 19 is intermittently shifted by the shifting tooth 22 on the outer wall of the shifting plate 21, so that the eccentric plate 13 rotates intermittently. During the rotation of the eccentric plate 13, the traction rod 17 is provided to pull the shifting screw 5 to move back and forth along the inner side of the screw sleeve 4, and then the screw sleeve 4 can be driven to rotate back and forth. The reciprocating rotation of the screw sleeve 4 will drive the shifting sleeve 6 to rotate back and forth. During the reciprocating rotation of the shifting sleeve 6, the meshing transmission of the shifting tooth 7 and the rack 2 can be used to control the moving seat 3 to move left or right, so as to The lateral monitoring range of the monitoring device 9 can be increased. At the same time, since the multiple toggle teeth 7 are intermittently arranged, the toggle sleeve 6 will intermittently engage with the rack 2 during the reciprocating rotation, so that when there is no meshing transmission, the moving seat 3 will not drive the monitoring device 9 to move, so that the monitoring device 9 can stay stably at the current position for monitoring, and since the eccentric disk 13 rotates intermittently, the toggle screw rod 5 intermittently drives the screw rod sleeve 4 to rotate, which further increases the residence time of the monitoring device 9 after moving, so that the monitoring device 9 can be stably parked for monitoring after moving.

[0018] like Figure 4 , Figure 9 and Figure 10 As shown, the guide rail 1 is located inside the moving seat 3 and is fixedly connected to a guide rod 23, and the guide rod 23 is slidably connected to the moving seat 3; Multiple springs 1 24 are fixedly connected to both sides of the moving seat 3, and a pressure strip 25 is fixedly connected to one end of the multiple springs 1 24 on the same side away from the moving seat 3. A rack 26 is fixedly connected to the opposite sides of the two pressure strips 25 and located above the moving seat 3. A gear 27 is fixedly connected to the outer wall of the shaft column 8, and the two racks 26 are meshed with the gear 27; The upper surface of the movable seat 3 is symmetrically provided with an anti-slip groove 39, the interior of the anti-slip groove 39 is fixedly connected with an anti-slip rod 40, the outer side wall of the anti-slip rod 40 is slidably connected with an anti-slip block 41, and the top of the anti-slip block 41 is fixedly connected to the lower surface of the rack 26; A plurality of slots 43 are provided on both sides of the inner rear surface of the guide rail 1, and a blocking plate 44 is engaged with the inner sides of the slots 43 located on the left and right sides of the inner side of the guide rail 1; During the reciprocating movement of the moving seat 3 along the guide rod 23, the two pressure strips 25 on the left and right sides can respectively contact the blocking plates 44 on the left and right sides of the guide rail 1, and squeeze the pressure strips 25 as they move, so that the rack 26 can be moved, and the gear 27 is driven by the rack 26 to rotate the monitoring device 9. Therefore, when the monitoring device 9 moves to the right and left sides along the guide rail 1, it will rotate to the right and left sides respectively, further increasing the monitoring range, and through the set spring 1 24, after the pressure strip 25 loses the extrusion, it is reset by the spring 1 24, driving the monitoring device 9 to rotate and reset, which is convenient for monitoring during lateral movement. The blocking plates 44 can be inserted into the slots 43 at different positions, so that after the moving seat 3 moves to different distances, the pressure strip 25 is blocked, so that the pressure strip 25 is squeezed, and the monitoring device 9 is driven to turn.

[0019] like Figure 1 and Figure 2 As shown, both sides of the lower surface of the guide rail 1 are fixedly connected with fixing bars 28, a cross bar 29 is fixedly connected between the two fixing bars 28, a sliding block 30 is slidably connected to the outer wall of the cross bar 29, and a plurality of support rods 31 are fixedly connected between the rear surface of the sliding block 30 and the lower surface of the mounting seat 10; It plays a supporting and reinforcing role on the mounting seat 10.

[0020] like Figure 3 As shown, a moving piece 32 is fixedly connected to the front surface of the concave member 18 and the outer wall of the toggle screw rod 5, and two longitudinal rods 33 are slidably connected to the lower part of the inner part of the moving piece 32, and the front end of the longitudinal rod 33 is fixedly connected to the inner front surface of the mounting seat 10; It plays a guiding role in the movement of the screw rod 5.

[0021] like Figure 6 As shown, the inner side of the adjustment block 15 located on the right side of the installation box 11 is threadedly connected with an adjustment bolt 34, and the bottom end of the adjustment bolt 34 is rotatably connected to the lower surface of the adjustment slot 14 located on the right side of the installation box 11 through a rotating shaft; The adjusting bolt 34 can be held and rotated to control the adjusting block 15 to slide along the adjusting groove 14, thereby controlling the distance between the cylinder 16 and the central axis of the eccentric disk 13. Then, when the eccentric disk 13 rotates, the reciprocating distance of the traction rod 17 pulling the screw rod 5 can be adjusted, so that the monitoring device 9 can control the range of left and right reciprocating movement under different monitoring requirements.

[0022] like Figure 7 and Figure 8 As shown, a plurality of hemispherical holes 35 are provided on the right side of the gear 19; A shrinking cylinder 36 is fixedly connected to the right side of the installation box 11 and above the motor 20. A plurality of shrinking cavities 37 are provided inside the shrinking cylinder 36. A limiting column 38 is slidably connected inside the shrinking cavity 37. The left end of the limiting column 38 is inserted into the inner side of the hemispherical hole 35. A spring 2 42 is fixedly connected between the shrinking cavity 37 and the limiting column 38. The limiting column 38 is inserted into the inner part of the hemispherical hole 35 and is a spherical plug, so that when the gear 19 is turned, the limiting column 38 can be separated from the hemispherical hole 35, thereby not affecting the normal transmission rotation of the gear 19. At the same time, the limiting column 38 is inserted into the inner part of the hemispherical hole 35 to limit the gear 19, thereby preventing the gear 19 from rotating when it is turned, resulting in the problem of instability after the monitoring device 9 moves.

[0023] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A camera component capable of increasing the monitoring range, comprising a guide rail (1), characterized in that: A first rack (2) is fixedly connected to the front surface of the guide rail (1); A moving seat (3) is arranged above the guide rail (1). A lead screw sleeve (4) is rotatably connected to the inside of the moving seat (3) through a rotating shaft. A shifting lead screw (5) is arranged inside the lead screw sleeve (4). A shifting sleeve (6) is fixedly connected to the outer side wall of the lead screw sleeve (4) above the first rack (2). A plurality of first shifting teeth (7) are fixedly connected to the outer side wall of the shifting sleeve (6); A shaft column (8) is rotatably connected to the upper surface of the moving seat (3) through a rotating shaft. A monitoring device (9) is fixedly connected to the top end of the shaft column (8); An installation seat (10) is fixedly connected to the lower surface of the moving seat (3) behind the guide rail (1). An installation box (11) is fixedly connected to the upper surface of the installation seat (10). A shaft rod (12) is rotatably connected to the left side inside the installation box (11) through a rotating shaft. Two eccentric discs (13) are arranged at the right end of the shaft rod (12). The left center of the eccentric disc (13) located on the left side inside the installation box (11) is fixedly connected to the right end of the shaft rod (12). An adjustment groove (14) penetrating through is formed in the left side of the eccentric disc (13). An adjustment block (15) is slidably connected to the inside of the adjustment groove (14). A cylinder (16) is fixedly connected between the two adjustment blocks (15). A traction rod (17) is rotatably connected to the outer side wall of the cylinder (16) through a rotating shaft. One end of the traction rod (17) is rotatably connected to a concave member (18) through a rotating shaft. The front surface of the concave member (18) is fixedly connected to the rear end of the shifting lead screw (5).

2. The camera component capable of increasing the monitoring range according to claim 1, characterized in that: A first gear (19) is fixedly connected to the right center of the eccentric disc (13) located on the right side inside the installation box (11). A motor (20) is fixedly connected to the lower right side inside the installation box (11). A shifting disc (21) is fixedly connected to the left end of the output shaft of the motor (20) and below the first gear (19). A second shifting tooth (22) is fixedly connected to the outer side wall of the shifting disc (21); A guide rod (23) is fixedly connected to the inside of the guide rail (1) inside the moving seat (3). The guide rod (23) is slidably connected to the moving seat (3).

3. The camera component capable of increasing the monitoring range according to claim 1, wherein: A plurality of first springs (24) are fixedly connected to both sides of the moving seat (3). The ends of the plurality of first springs (24) on the same side away from the moving seat (3) are commonly fixedly connected to a pressure-receiving strip (25). A second rack (26) is commonly fixedly connected to the opposite sides of the two pressure-receiving strips (25) and above the moving seat (3). A second gear (27) is fixedly connected to the outer side wall of the shaft column (8). The second rack (26) is meshed with the second gear (27).

4. A camera component capable of increasing the monitoring range according to claim 1, characterized in that: On both sides of the lower surface of the guide rail (1), there are fixedly connected fixing strips (28). Between the two fixing strips (28), there is a cross bar (29) fixedly connected. The outer side wall of the cross bar (29) is slidably connected with a sliding block (30). Between the rear surface of the sliding block (30) and the lower surface of the mounting seat (10), there are fixedly connected a plurality of support rods (31).

5. The camera component capable of increasing the monitoring range according to claim 1, wherein: On the front surface of the concave member (18) and on the outer side wall of the shifting lead screw (5), there is a moving piece (32) fixedly connected. Inside the moving piece (32) and below, there are two longitudinal rods (33) slidably connected. The front ends of the longitudinal rods (33) are fixedly connected with the inner front surface of the mounting seat (10).

6. The camera component capable of increasing the monitoring range according to claim 1, characterized in that: On the inner side of the adjusting block (15) located on the right side inside the mounting box (11), there is an adjusting bolt (34) threadedly connected. The bottom end of the adjusting bolt (34) is rotationally connected with the lower surface of the adjusting groove (14) located on the right side inside the mounting box (11) through a rotating shaft.

7. The camera component capable of increasing the monitoring range according to claim 1, characterized in that: On the right side of the first gear (19), there are a plurality of hemispherical holes (35) opened. Inside the mounting box (11) and above the motor (20) on the right side, there is a contraction cylinder (36) fixedly connected. Inside the contraction cylinder (36), there are a plurality of contraction cavities (37) opened. Inside the contraction cavity (37), there is a limit post (38) slidably connected. The left end of the limit post (38) is inserted into the inner side of the hemispherical hole (35). Between the contraction cavity (37) and the limit post (38), there is a second spring (42) fixedly connected.

8. The camera assembly capable of increasing the monitoring range according to claim 1, wherein: On both sides of the inner rear surface of the guide rail (1), there are a plurality of clamping grooves (43) opened. Inside the clamping grooves (43) located on the left side and the right side inside the guide rail (1), there are blocking plates (44) engaged.

9. A camera component capable of increasing the monitoring range according to claim 1, characterized in that: On the upper surface of the moving seat (3), anti - detachment grooves (39) are symmetrically arranged front and back. Inside the anti - detachment grooves (39), there are anti - detachment rods (40) fixedly connected. The outer side wall of the anti - detachment rods (40) is slidably connected with anti - detachment blocks (41). The top of the anti - detachment blocks (41) is fixedly connected with the lower surface of the second rack (26).

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